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Related Experiment Videos

Overnight decrease in hematocrit after nasal CPAP treatment in patients with OSA.

J Krieger1, E Sforza, M Barthelmebs

  • 1Service d'Explorations Fonctionnelles du Système Nerveux, University Hospital, Strasbourg, France.

Chest
|March 1, 1990
PubMed
Summary
This summary is machine-generated.

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Nasal continuous positive airway pressure (CPAP) treatment for obstructive sleep apnea (OSA) causes hemodilution, indicated by decreased hematocrit and red blood cell counts. This finding helps explain reduced edema and fluid shifts in OSA patients undergoing CPAP therapy.

Area of Science:

  • Cardiology
  • Pulmonology
  • Nephrology

Background:

  • Obstructive sleep apnea (OSA) is associated with fluid retention and peripheral edema.
  • The mechanism behind decreased urine and sodium excretion with nasal continuous positive airway pressure (CPAP) treatment in OSA patients was unclear.

Purpose of the Study:

  • To investigate the immediate effects of nasal CPAP on hematocrit and red blood cell count in OSA patients.
  • To clarify the paradox of reduced edema and natriuresis during CPAP treatment for OSA.

Main Methods:

  • Eight patients with OSA were treated with nasal CPAP.
  • Hematocrit and red blood cell counts were measured before and during CPAP treatment.

Main Results:

  • A significant decrease in hematocrit was observed (mean 45.6% to 43.0%).

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  • Red blood cell count also decreased significantly (mean 4.777 to 4.577 million/cu mm).
  • These changes indicate hemodilution in OSA patients treated with CPAP.

    • Conclusions:

    • Nasal CPAP treatment induces hemodilution in OSA patients.
    • This hemodilution may be linked to atrial natriuretic peptide effects and fluid shifts.
    • The findings support the explanation for reduced peripheral edema and altered sodium/urine excretion during CPAP therapy for OSA.